Image of a brain cheering

CryptoHack

A free, fun platform for learning modern cryptography

Image of a cloud pouring information into a head

Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

Level up image of a warrior

Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

New ideas in development

Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 trebirthed 9915
#2 annonacin 6055
#3 lhr 2815
#4 ronkkeli 1970
#5 shaylatyagi 1695
Recent Solves
Hex kdngiorgos
Chinese Remainder Theorem SorcierMaheP
Hamiltonicity 1 annonacin
Hamiltonicity (CryptoHack) annonacin
Modulus Inutilis elyessmida
Recent Solutions
Adrien's Signs prt4tham 0
Chinese Remainder Theorem prt4tham 0
Scalar Multiplication IAnmar0 0
Point Addition IAnmar0 0
XOR Properties w4llfac3r 0

Level Up

level up icon

You are now level Current level